川西岷江河谷典型大型—巨型古滑坡特征物探解译分析

发布时间：2018-03-07 17:12

本文选题：岷江河谷　切入点：大型—巨型古滑坡　出处：《地质力学学报》2017年05期 　论文类型：期刊论文

【摘要】：在遥感解译、野外调查的基础上,采用高密度电法和电阻率测深法,并结合钻探对川西岷江河谷发育的尕米寺滑坡、俄寨村滑坡、格机寨滑坡等典型大型—巨型古滑坡的空间结构进行了勘探分析,有效确定了古滑坡的空间结构和滑带特征,并认为古滑坡的滑动面多具有高低阻相间的不稳定电性层,且滑坡前缘多位于不稳定电性层变薄收敛的地方。其中,俄寨村滑坡高低阻相间的不稳定电性层厚约0~45 m,为滑坡堆积层,古滑动面紧贴基岩面,滑动面平均埋深约30 m,弱风化基岩面埋深约5.6~61 m,强风化层厚约为3~12 m;尕米寺滑坡高低阻相间的不稳定电性层厚约2.5~43 m,为滑坡堆积层,沿剖面古滑动面平均埋深约35 m,在滑坡中部存在一圈闭的低阻异常体,推测为古河道,并与钻探结果相吻合,其埋深约56~96 m,弱风化基岩面埋深13.3~100 m,强风化及岩溶综合层厚一般约为5~20 m。基于古滑坡的地球物理勘探数据和解译结果,统计分析了川西岷江河谷地区大型—巨型古滑坡空间岩土体的地球物理物性参数,对指导该区滑坡调查分析具有重要的指导意义。
[Abstract]:On the basis of remote sensing interpretation and field investigation, high density electrical method and resistivity sounding method were used, and combined with drilling, Gamei landslide and Ezhai village landslide developed in Minjiang River valley of western Sichuan were studied. The spatial structure of typical large-scale and giant ancient landslide, such as Gejizhai landslide, is explored and analyzed. The spatial structure and slip zone characteristics of the ancient landslide are effectively determined, and it is considered that the sliding surface of the ancient landslide has the unstable electric layer between high and low resistance phases. The front edge of the landslide is located in the place where the unstable electric layer is thinning and converging. The thickness of the unstable electric layer between the high and low resistance phases of the Ezhaicun landslide is about 0 ~ 45 m, which is the accumulation layer of the landslide, and the paleo-slip surface is close to the bedrock surface. The average buried depth of sliding surface is about 30 m, the buried depth of weak weathered bedrock is about 5.661 m, the thickness of strong weathering layer is about 3 ~ 12 m, the thickness of unstable electrical layer between high and low resistance phases of Gameisi landslide is about 2.54m, which is the accumulation layer of landslide. The average buried depth along the paleo-slip surface of the section is about 35 m, and there is a trap anomaly in the middle of the landslide, which is presumed to be the paleochannel, and is consistent with the drilling results. Its buried depth is about 56 ~ 96 m, the buried depth of weakly weathered bedrock is 13. 3 ~ 100 m, and the thickness of strong weathering and karst comprehensive layer is about 5 ~ 20 m. Based on the geophysical exploration data and interpretation results of paleo-landslide, The geophysical and physical parameters of large-giant ancient landslide spatial rock and soil in Minjiang river valley area of western Sichuan are statistically analyzed which is of great significance for guiding the investigation and analysis of landslide in this area.
【作者单位】：中国地质科学院地质力学研究所;中国地质大学(北京)地球科学与资源学院;国土资源部新构造运动与地质灾害重点实验室;四川地矿局物探队;
【基金】：中国地质调查局项目(DD20160271) 国家自然科学基金项目(41402321)
【分类号】：P642.22

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